deps: V8: cherry-pick fa7509f48d15

Original commit message:

    [cppgc] add cppgc::Visitor::TraceExternal()

    This allows tracking externally-managed memory owned by cppgc-managed
    objects in the heap snapshots.

    To accompany this API, a class cppgc::External is added to abstract
    over externally-managed structures.

    Design doc: https://docs.google.com/document/d/1-kHbj9SNL3wMXZz_GZiDw6kHUJ1IvicFzEmqC_um0Wg/edit#heading=h.n1atlriavj6v

    Change-Id: I7a27eaa45e29d3c14936997d115a112a6e54458c

Refs: v8/v8@fa7509f

Author: joyeecheung

common.gypi

@@ -36,7 +36,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.13',
+    'v8_embedder_string': '-node.14',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/BUILD.bazel

@@ -567,6 +567,7 @@ filegroup(
         "include/cppgc/default-platform.h",
         "include/cppgc/ephemeron-pair.h",
         "include/cppgc/explicit-management.h",
+        "include/cppgc/external.h",
         "include/cppgc/garbage-collected.h",
         "include/cppgc/heap.h",
         "include/cppgc/heap-consistency.h",

deps/v8/BUILD.gn

@@ -6920,6 +6920,7 @@ v8_header_set("cppgc_headers") {
     "include/cppgc/default-platform.h",
     "include/cppgc/ephemeron-pair.h",
     "include/cppgc/explicit-management.h",
+    "include/cppgc/external.h",
     "include/cppgc/garbage-collected.h",
     "include/cppgc/heap-consistency.h",
     "include/cppgc/heap-handle.h",

deps/v8/include/cppgc/external.h

@@ -0,0 +1,23 @@
+// Copyright 2024 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_EXTERNAL_H_
+#define INCLUDE_CPPGC_EXTERNAL_H_
+
+#include <cstddef>
+
+namespace cppgc {
+
+class Visitor;
+
+class External {
+ public:
+  virtual void Trace(cppgc::Visitor*) const {}
+  virtual const char* GetHumanReadableName() const = 0;
+  virtual size_t GetSize() const = 0;
+};
+
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_EXTERNAL_H_

deps/v8/include/cppgc/visitor.h

@@ -22,6 +22,8 @@
 
 namespace cppgc {
 
+class External;
+
 namespace internal {
 template <typename T, typename WeaknessPolicy, typename LocationPolicy,
           typename CheckingPolicy>
@@ -306,6 +308,11 @@ class V8_EXPORT Visitor {
                        callback_data);
   }
 
+  /**
+   * Trace method for members with externally-managed memory.
+   */
+  void TraceExternal(const External* external) { VisitExternal(external); }
+
   /**
    * Registers a slot containing a reference to an object allocated on a
    * compactable space. Such references maybe be arbitrarily moved by the GC.
@@ -359,6 +366,7 @@ class V8_EXPORT Visitor {
   virtual void VisitWeakContainer(const void* self, TraceDescriptor strong_desc,
                                   TraceDescriptor weak_desc,
                                   WeakCallback callback, const void* data) {}
+  virtual void VisitExternal(const External* external) {}
   virtual void HandleMovableReference(const void**) {}
 
   virtual void VisitMultipleUncompressedMember(